I know Kogan's price is 777(https://www.ozbargain.com.au/node/235303), but due to its slow delivery and warranty, I prefer buy from dell. Just chatted with dell sales and they match ao3's price which is 782 (http://www.ao3.com.au/product/P2715Q), if you have more time and talk to different sales may be they can match kogan's price (747.48, https://www.kogan.com/au/buy/dell-p2715q-27-uhd-4k-ultrashar…). Just give you some tips, mention you can order right now if you can get this price. Good luck, mate.
BTW:
I bought a U2515H monitor for $437 at the beginning of this month, use same approach.
PS: You can't use cashrewards, a little pity.
Who did you price match the U2515h with?